How to Solve the Problem of Loud Noise During Cold Start?

[Sally]

Check and determine whether the noise is caused by engine or other accessory damage. Choose engine oil with appropriate viscosity for winter and replace it. During cold start, the engine oil is in the oil pan, so you need to start the engine and wait for a while.

[VanLeo]

A few days ago, my car also had very loud noises during cold starts, sounding like the engine was roaring. After researching, I found that the main reason is usually that the engine oil is too thick. In cold weather, its fluidity decreases, leading to insufficient lubrication and increased friction between components. The solution is simple: switch to a suitable synthetic oil, recommended viscosities being 0W-20 or 5W-30, especially in winter. Also, check the hydraulic lifters and belts—worn lifters can produce a ticking sound, and loose belts can squeak. I’ve used engine additives to reduce noise, but the key is regular maintenance, checking oil levels and quality monthly. Don’t ignore this issue—prolonged neglect can accelerate engine wear. It’s best to take it to a repair shop for a thorough inspection; spending a little money now can prevent bigger problems. After these steps, my car runs much quieter, making winter driving much more pleasant.

[VonIker]

I often help friends with car repairs. Common causes of cold start noise include low oil temperature leading to high oil viscosity and insufficient lubrication, or airlock in hydraulic components. Immediate action is recommended: First, switch to a low-viscosity synthetic oil like 5W-30 to ensure better fluidity, which can reduce cold start noise by half. Additionally, check the belt tension—if it's too loose or worn out, it may squeak, so timely tightening or replacement is advised. Loose alternator mounts can also cause vibration noise, which can be improved with simple tightening. In daily use, I let the car warm up for a minute before starting, as this helps the oil film form quickly and ensures more even lubrication. Change the oil every six months without waiting for it to degrade, saving both money and hassle. If issues arise, consult a professional mechanic early to avoid major repairs.

[LaKhloe]

The noise is terrifying, don't delay. During cold starts, slow oil flow is the main cause, leading to increased friction between components. The solution is to first switch to the right viscosity oil, such as 0W-20. Also, check the hydraulic lifters, as aged ones can cause noise. If the belt is worn, adjust or replace it promptly. From a safety perspective, noise could be a sign of engine issues, and ignoring it may lead to failures. I recommend going to a repair shop as soon as possible to have a technician diagnose and eliminate potential risks, ensuring driving reliability. Daily prevention: use high-quality oil, choose products specifically designed for cold starts in winter, and maintain stable vehicle condition. Keep regular maintenance records to identify and address issues early.